This encouraging result of the Z-scan studies suggests that the VSNS crystal is a candidate material for photonics devices, optical switches, and optical power limiting applications. The second-order molecular hyperpolarizability γ of the crystal grown was 7.986 × 10 −34 esu. The third-order nonlinear optical property of VSNS was investigated in detail using a Z-scan technique with He–Ne laser at 632.8 nm. Variation of the dielectric response of the grown crystal was studied at room temperature. Laser damage threshold energy was measured using an Nd:YAG laser (1064 nm). Layer growth pattern was observed in chemical etching studies using a Carl Zeiss optical microscope at 50× magnification. The high quality transparent crystals up to a size 10×7×5 mm3 are obtained with in fifteen days. The thermal stability of the crystal was analyzed by TG–DTA studies, and the hardness, Meyer index, yield strength, and elastic stiffness constant were estimated using a Vickers microhardness tester. The single crystals were grown using slow evaporation solution growth technique. The luminescence property of the crystal grown showed green emission radiation. Optical absorption was recorded using UV-Vis-NIR spectral analysis, and linear optical constants such as the absorption coefficient, band gap, extinction coefficient, refractive index and reflectance were calculated. The crystalline nature of the title material was analyzed by powder X-ray diffraction analysis, and the presence of expected functional groups and the molecular structure of VSNS was identified by FT-IR and 1H NMR spectroscopic studies. A single crystal X-ray diffraction study confirmed the crystal structure and morphology of VSNS. Solubility of the synthesized VSNS material was experimentally determined for various temperatures using a methanol–acetonitrile mixed solvent. Single crystals were grown in a mixed solvent of methanol–acetonitrile (1 : 1) using a slow evaporation method at room temperature. A new organic stilbazolium derivative crystal 2-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C 25H 23NO 5S♲H 2O) (VSNS) was synthesized successfully.
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